[Show abstract][Hide abstract]ABSTRACT: We report Swift/BAT survey observations of the Tycho's supernova remnant,
performed over a period of 104 months since the mission's launch. The remnant
is detected with high significance (>10 sigma) below 50 keV. We detect
significant hard X-ray emission in the 60-85 keV band, above the continuum
level predicted by a simple synchrotron model. The location of the observed
excess is consistent with line emission from radioactive Titanium-44, so far
reported only for Type II supernova explosions. We discuss the implications of
these results in the context of the galactic supernova rate, and
nucleosynthesis in Type Ia supernova.

[Show abstract][Hide abstract]ABSTRACT: The X-ray nova and black hole candidate GRS 1739-278 is currently in outburst as detected in the Swift/BAT hard X-ray transient monitor in the 15-50 keV band. The current outburst began on 2014 March 9 (MJD 56725) when it had a count rate of 0.0024 +/- 0.0009 ct/s/cm^2 (~10 mCrab). It has continued to brighten, reaching a rate of 0.019 +/- 0.002 ct/s/cm^2 (~85 mCrab) on 2014 March 17. This is the first outburst from this source yet observed in the BAT monitor or by Swift, and as far as we can determine, the first outburst since discovery by SIGMA/Granat in March 1996 (Vargas et al., 1997, MNRAS 476, L23).

[Show abstract][Hide abstract]ABSTRACT: The RS Canum Venaticorum type variable star UX Ari is currently in outburst as detected in the Swift/BAT hard X-ray transient monitor in the 15-50 keV band. The current outburst began on 2014 February 14 (MJD 56702) when it had a count rate of 0.004 +/- 0.002 ct/s/cm^2 (~20 mCrab). It continued to brighten, reaching a rate of 0.013 +/- 0.003 ct/s/cm^2 (~60 mCrab) on 2014 February 17. It has since faded somewhat, with a rate of 0.005 +/- 0.002 ct/s/cm^2 (~20 mCrab) on 2014 February 19.

[Show abstract][Hide abstract]ABSTRACT: The Swift/BAT hard X-ray transient monitor has been operating
continuously since October 2006 as a near real-time full-sky monitor in
the 15-50 keV energy range with a detection sensitivity of ~5 mCrab; and
the first major monitor catalog paper has just been published. Here we
review the many important findings of the transient monitor, with
particular emphasis on the 18 previously unknown galactic and
extra-galactic sources that were first uncovered by the monitor. This
list includes six neutron stars, five black hole candidates and a tidal
disruption flare event. We will also summarize and classify the 246
sources previously known, or discovered elsewhere, which have been
detected in the transient monitor either with persistent emission (146
sources) or in outburst (100 sources). We will also briefly discuss the
recent improvements to the monitor and plans for the future.

[Show abstract][Hide abstract]ABSTRACT: The Be/X-ray binary and transient pulsar RX J0059.2-7138 (also known as SXP 2.76) in the Small Magellanic Cloud has been detected in the 15-50 keV band in the Swift/BAT hard X-ray transient monitor. The source was detected in the BAT monitor starting on 2013 December 26 (MJD 56652) with a count rate of 0.002 +/- 0.0006 ct/s/cm^2 (~10 mCrab). The source has remained detectable since that time with a slowly rising flux, reaching 0.005 +/- 0.001 ct/s/cm^2 (~25 mCrab) on 2014 January 9.

[Show abstract][Hide abstract]ABSTRACT: The Be/X-ray binary RX J0520.5-6932 has been detected in the 15-50 keV
band in the Swift/BAT hard X-ray transient monitor. The source was
detected in the BAT monitor starting on 2013 December 18 (MJD 56644)
with a count rate of 0.003 +/- 0.0005 ct/s/cm^2 (~14 mCrab). Archival
data was searched back to the beginning of 2013 and no other time
intervals (on the time scale of one day) were found with a significant
rate increase above background.